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first detected in 1960. ddt was once considered safe and in this archived footage from u.s. government, ddt can be seen widely sprayed on agricultural fields to kill pest and even directly on pep. today it's a known carcinogen. the site was cleaned up, removing 100,000 cubic yards of soil highly contaminated by the pesticide. immediate test result shows that it worked. >> a year later, when we came back to do yearly monitoring, unfortunately, the level went back up. now the superfund site is scheduled to be cleaned up again, but not until 2015. while that location in the inner richmond harbor is highly contaminated, the epa says it's also somewhat isolate and says there is no indication that ddt there is make its way out tot bay. but birds and fish that move in and out of the inner richmond harbor are exposed and until a second clean-up is completed, fishermen are advised to avoid the area. >> they don't break down in the environment. they build up in fish and then they build up in humans are. >> he is with contra costa health services that posted signs,sips that often go ignored. o
years ago this was the site of what remains to this day the largest oil spill in u.s. history. we are in kern county, california, the heart of the state's oil country. in march of 1910 the oil was still in its infancies. they were drilling on this site and this they reached a depth of more than 2200 feet they hit what would come to be known as the lake view gusher. >> the well blew out and this crater you see around here. >> reporter: bruce helm's family has been in the oil industry for three decades. >> no blow-out preventers or nothing. when it came you had to run for your life. record are here at the museum there is a replica of the wooden oil derrick they used a decade ago. this is more than 100 feet high. but the oil was spewing more than 200 feet into the air. in fact, locals say on a calm day you could see black columns of oil mist one-half mile in the sky. back on the ground, you can still see remnants of the lake view gusher today. the oil turned the soil here basically into asphalt. at its peak, the lake view gusher spewed out 100,000- barrels of oil per day. that's more
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